[flang][driver] add negative from of -fsave-main-program (#124110)

Add the `-fno` form for consistency and to make it easy to switch the
default for downstream users.

Reland "[Flang][Driver] Add a flag to control zero initialization" (#123606)

Reverts llvm/llvm-project#123330

Revert "Revert "Revert "[Flang][Driver] Add a flag to control zero initializa…" (#123330)

Reverts llvm/llvm-project#123097

Reverting due to buildbot failure
https://lab.llvm.org/buildbot/#/build

Revert "Revert "Revert "[Flang][Driver] Add a flag to control zero initializa…" (#123330)

Reverts llvm/llvm-project#123097

Reverting due to buildbot failure
https://lab.llvm.org/buildbot/#/builders/89/builds/14577.

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Revert "Revert "[Flang][Driver] Add a flag to control zero initializa… (#123097)

…tion of global v…" (#123067)"

This reverts commit 44ba43aa2b740878d83a9d6f1d52a333c0d48c22.

Adds the flag to b

Revert "Revert "[Flang][Driver] Add a flag to control zero initializa… (#123097)

…tion of global v…" (#123067)"

This reverts commit 44ba43aa2b740878d83a9d6f1d52a333c0d48c22.

Adds the flag to bbc as well.

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[flang] Add -f[no-]unroll-loops flag (#122906)

Revert "[Flang][Driver] Add a flag to control zero initialization of global v…" (#123067)

Reverts llvm/llvm-project#122144

Reverting due to CI failure
https://lab.llvm.org/buildbot/#/builders/89

Revert "[Flang][Driver] Add a flag to control zero initialization of global v…" (#123067)

Reverts llvm/llvm-project#122144

Reverting due to CI failure
https://lab.llvm.org/buildbot/#/builders/89/builds/14422

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[Flang][Driver] Add a flag to control zero initialization of global v… (#122144)

…ariables

Patch adds a flag to control zero initialization of global variables
without default initialization. Th

[Flang][Driver] Add a flag to control zero initialization of global v… (#122144)

…ariables

Patch adds a flag to control zero initialization of global variables
without default initialization. The default is to zero initialize.

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[flang][Driver] Preliminary support for -ftime-report (#122894)

The behavior is not entirely consistent with that of clang for the
moment since detailed timing information on the LLVM IR optimizati

[flang][Driver] Preliminary support for -ftime-report (#122894)

The behavior is not entirely consistent with that of clang for the
moment since detailed timing information on the LLVM IR optimization and
code generation passes is not provided. The -ftime-report= option is
also not enabled since that is only relevant for information about the
LLVM IR passes. However, some code to handle that option has been
included, to make it easier to support the option when the issues
blocking it are resolved. A FortranSupport library has been created that
is intended to mirror the LLVM and MLIR support libraries.

Based on @tarunprabhu's PR
https://github.com/llvm/llvm-project/pull/107270 with minor changes
addressing latest review feedback. He's busy and we'd like to get this
support in ASAP.

Co-authored-by: Tarun Prabhu <tarun.prabhu@gmail.com>

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[flang][driver] add option to make all main program variable static (#121968)

Co-authored-by: Kiran Chandramohan <kiranchandramohan@gmail.com>

[flang] Add UNSIGNED (#113504)

Implement the UNSIGNED extension type and operations under control of a
language feature flag (-funsigned).

This is nearly identical to the UNSIGNED feature that h

[flang] Add UNSIGNED (#113504)

Implement the UNSIGNED extension type and operations under control of a
language feature flag (-funsigned).

This is nearly identical to the UNSIGNED feature that has been available
in Sun Fortran for years, and now implemented in GNU Fortran for
gfortran 15, and proposed for ISO standardization in J3/24-116.txt.

See the new documentation for details; but in short, this is C's
unsigned type, with guaranteed modular arithmetic for +, -, and *, and
the related transformational intrinsic functions SUM & al.

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[flang] Support -f[no-]realloc-lhs. (#120165)

-frealloc-lhs is the default.
If -fno-realloc-lhs is specified, then an allocatable on the left
side of an intrinsic assignment is not implicitly (re)

[flang] Support -f[no-]realloc-lhs. (#120165)

-frealloc-lhs is the default.
If -fno-realloc-lhs is specified, then an allocatable on the left
side of an intrinsic assignment is not implicitly (re)allocated
to conform with the right hand side. Fortran runtime will issue
an error if there is a mismatch in shape/type/allocation-status.

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Reland "[flang] Integrate the option -flang-experimental-integer-overflow into -fno-wrapv" (#118933)

This relands #110063.
The performance issue on 503.bwaves_r is found not to be related to the
p

Reland "[flang] Integrate the option -flang-experimental-integer-overflow into -fno-wrapv" (#118933)

This relands #110063.
The performance issue on 503.bwaves_r is found not to be related to the
patch, and is resolved by fbd89bcc when LTO is enabled.

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[flang][Driver] Support -print-supported-cpus and associated aliases (#117199)

The aliases are -mcpu=help and -mtune=help. There is still an issue with
the output which prints an example line that

[flang][Driver] Support -print-supported-cpus and associated aliases (#117199)

The aliases are -mcpu=help and -mtune=help. There is still an issue with
the output which prints an example line that references clang. That is
not fixed here because it is printed in llvm/MC/SubtargetInfo.cpp. Some
more thought is needed to determine how best to handle this.

Fixes #117010

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[flang] Support -mabi=vec-extabi and -mabi=vec-default on AIX (#113215)

This option is to enable the AIX extended and default vector ABIs.

Revert "[flang] Integrate the option -flang-experimental-integer-overflow into -fno-wrapv" (#113901)

Reverts llvm/llvm-project#110063 due to the performance regression on
503.bwaves_r in SPEC2017.

[flang] Integrate the option -flang-experimental-integer-overflow into -fno-wrapv (#110063)

nsw is now added to do-variable increment when -fno-wrapv is enabled as
GFortran seems to do.
That means

[flang] Integrate the option -flang-experimental-integer-overflow into -fno-wrapv (#110063)

nsw is now added to do-variable increment when -fno-wrapv is enabled as
GFortran seems to do.
That means the option introduced by #91579 isn't necessary any more.

Note that the feature of -flang-experimental-integer-overflow is enabled
by default.

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[flang][Driver] Add support for -f[no-]wrapv and -f[no]-strict-overflow in the frontend (#110061)

This patch introduces the options for integer overflow flags into Flang.
The behavior is similar to

[flang][Driver] Add support for -f[no-]wrapv and -f[no]-strict-overflow in the frontend (#110061)

This patch introduces the options for integer overflow flags into Flang.
The behavior is similar to that of Clang.

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[clang][flang][mlir] Reapply "Support -frecord-command-line option (#102975)"

The underlying issue was caused by a file included in two different
places which resulted in duplicate definition error

[clang][flang][mlir] Reapply "Support -frecord-command-line option (#102975)"

The underlying issue was caused by a file included in two different
places which resulted in duplicate definition errors when linking
individual shared libraries. This was fixed in c3201ddaeac02a2c86a38b
[#109874].

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[flang][driver] rename flang-new to flang (#110023)

This does a global rename from `flang-new` to `flang`. I also
removed/changed any TODOs that I found related to making this change.

---------

[flang][driver] rename flang-new to flang (#110023)

This does a global rename from `flang-new` to `flang`. I also
removed/changed any TODOs that I found related to making this change.

---------

Co-authored-by: H. Vetinari <h.vetinari@gmx.com>
Co-authored-by: Andrzej Warzynski <andrzej.warzynski@arm.com>

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[flang][preprocessor] Don't expand INCLUDE under -E by default (#110333)

Fortran INCLUDE lines have (until now) been treated like #include
directives. This isn't how things work with other Fortran

[flang][preprocessor] Don't expand INCLUDE under -E by default (#110333)

Fortran INCLUDE lines have (until now) been treated like #include
directives. This isn't how things work with other Fortran compilers when
running under the -E option for preprocessing only, so stop doing it by
default, and add -fpreprocess-include-lines to turn it back on when
desired.

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[flang][driver] Make the -J option less restrictive so we would not have to struggle with autoconf (#110010)

There are autoconf-configured projects for which the generated Makefile
is invoking flan

[flang][driver] Make the -J option less restrictive so we would not have to struggle with autoconf (#110010)

There are autoconf-configured projects for which the generated Makefile
is invoking flang with more than one -J option, each one specifying the
same directory. Although only one module directory should be specified
(by either -J or -module-dir), it should not really matter how many
times this same directory has been specified.

Apparently, other compilers understand it that way, hence autoconf's
configure script may generate a Makefile with the repetitive -J's.

For example, when trying to build the ABINIT [1] project (which can be
configured by either CMake or the configure script) when configured by
autoconf, it fails to build as such:

```
make[3]: Entering directory 'src/98_main'
mpifort -DHAVE_CONFIG_H -I. -I../../../src/98_main -I../.. -I../../src/incs -I../../../src/incs -Ifallbacks/exports/include -Jbuild/mods -Jbuild/mods -c -o abinit-abinit.o `test -f 'abinit.F90' || echo '../../../src/98_main/'`abinit.F90
error: Only one '-module-dir/-J' option allowed
make[3]: *** [Makefile:3961: abinit-abinit.o] Error 1
```

This patch solves the problem.

[1] https://github.com/abinit/abinit.git

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[flang][Semantics] Add LangOptions to SemanticsContext (#110013)

The motivation for this is to make OpenMP settings visible in the
semantic checks (OpenMP version in particular).

[flang][Frontend] Move LangOptions from Frontend to Common (#110012)

The information in LangOptions is not tied to any frontend code, and
could be used by any other component.

Revert "[clang][flang][mlir] Support -frecord-command-line option (#102975)"

This reverts commit b3533a156da92262eb19429d8c12f53e87f5ccec.

It caused test failures in shared library builds:
https://

Revert "[clang][flang][mlir] Support -frecord-command-line option (#102975)"

This reverts commit b3533a156da92262eb19429d8c12f53e87f5ccec.

It caused test failures in shared library builds:
https://lab.llvm.org/buildbot/#/builders/80/builds/3854

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[clang][flang][mlir] Support -frecord-command-line option (#102975)

Add support for the -frecord-command-line option that will produce the
llvm.commandline metadata which will eventually be saved i

[clang][flang][mlir] Support -frecord-command-line option (#102975)

Add support for the -frecord-command-line option that will produce the
llvm.commandline metadata which will eventually be saved in the object
file. This behavior is also supported in clang. Some refactoring of the
code in flang to handle these command line options was carried out. The
corresponding -grecord-command-line option which saves the command line
in the debug information has not yet been enabled for flang.

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