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| author | Tobias Burnus <burnus@net-b.de> | 2012-04-25 08:25:48 +0200 |
|---|---|---|
| committer | Tobias Burnus <burnus@gcc.gnu.org> | 2012-04-25 08:25:48 +0200 |
| commit | f1fb11f1e8322a94b90ea8c1a1cbae79c5f1bab5 (patch) | |
| tree | cf5861882524a9b89885cd03d357099ba5ab7625 /gcc/fortran/invoke.texi | |
| parent | ad1d9a5079591596b5ccd5a924a8b9c65c542e3e (diff) | |
| download | gcc-f1fb11f1e8322a94b90ea8c1a1cbae79c5f1bab5.zip gcc-f1fb11f1e8322a94b90ea8c1a1cbae79c5f1bab5.tar.gz gcc-f1fb11f1e8322a94b90ea8c1a1cbae79c5f1bab5.tar.bz2 | |
re PR fortran/52196 (Add -Wrealloc-lhs)
2012-04-25 Tobias Burnus <burnus@net-b.de>
PR fortran/52196
* lang.opt (Wrealloc-lhs, Wrealloc-lhs-all): New flags.
* gfortran.h (gfc_option_t): Add them.
* options.c (gfc_init_options, gfc_post_options,
gfc_handle_option): Handle them.
* invoke.texi: Document them.
* trans-expr.c (realloc_lhs_warning): New function.
(gfc_trans_arrayfunc_assign,
alloc_scalar_allocatable_for_assignment,
gfc_trans_assignment_1): Use it.
2012-04-25 Tobias Burnus <burnus@net-b.de>
PR fortran/52196
* gfortran.dg/realloc_on_assign_14.f90: New.
From-SVN: r186806
Diffstat (limited to 'gcc/fortran/invoke.texi')
| -rw-r--r-- | gcc/fortran/invoke.texi | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/gcc/fortran/invoke.texi b/gcc/fortran/invoke.texi index 38ebfe9..8db869b 100644 --- a/gcc/fortran/invoke.texi +++ b/gcc/fortran/invoke.texi @@ -146,9 +146,8 @@ and warnings}. -Wconversion -Wfunction-elimination -Wimplicit-interface @gol -Wimplicit-procedure -Wintrinsic-shadow -Wintrinsics-std @gol -Wline-truncation -Wno-align-commons -Wno-tabs -Wreal-q-constant @gol --Wsurprising -Wunderflow -Wunused-parameter -fmax-errors=@var{n} --fsyntax-only @gol --pedantic -pedantic-errors +-Wsurprising -Wunderflow -Wunused-parameter -Wrealloc-lhs Wrealloc-lhs-all @gol +-fmax-errors=@var{n} -fsyntax-only -pedantic -pedantic-errors } @item Debugging Options @@ -919,6 +918,23 @@ off via @option{-Wno-align-commons}. See also @option{-falign-commons}. Warn if any calls to functions are eliminated by the optimizations enabled by the @option{-ffrontend-optimize} option. +@item -Wrealloc-lhs +@opindex @code{Wrealloc-lhs} +@cindex Reallocate the LHS in assignments, notification +Warn when the compiler might insert code to for allocation or reallocation of +an allocatable array variable of intrinsic type in intrinsic assignments. In +hot loops, the Fortran 2003 reallocation feature may reduce the performance. +If the array is already allocated with the correct shape, consider using a +whole-array array-spec (e.g. @code{(:,:,:)}) for the variable on the left-hand +side to prevent the reallocation check. Note that in some cases the warning +is shown, even if the compiler will optimize reallocation checks away. For +instance, when the right-hand side contains the same variable multiplied by +a scalar. See also @option{-frealloc-lhs}. + +@item -Wrealloc-lhs-all +@opindex @code{Wrealloc-lhs-all} +Warn when the compiler inserts code to for allocation or reallocation of an +allocatable variable; this includes scalars and derived types. @item -Werror @opindex @code{Werror} @@ -1561,7 +1577,8 @@ need to be in effect. The parentheses protection is enabled by default, unless @cindex Reallocate the LHS in assignments An allocatable left-hand side of an intrinsic assignment is automatically (re)allocated if it is either unallocated or has a different shape. The -option is enabled by default except when @option{-std=f95} is given. +option is enabled by default except when @option{-std=f95} is given. See +also @option{-Wrealloc-lhs}. @item -faggressive-function-elimination @opindex @code{faggressive-function-elimination} |