[gcc/devel/c++-modules] i386: Add __attribute__ ((gcc_struct)) to struct fenv [PR95418]

[Nathan Sidwell]

https://gcc.gnu.org/g:832c1192eba6dd100e2f757e30ea6373f782ff55

commit 832c1192eba6dd100e2f757e30ea6373f782ff55
Author: Uros Bizjak <ubizjak@gmail.com>
Date:   Mon Jun 1 22:23:51 2020 +0200

    i386: Add __attribute__ ((gcc_struct)) to struct fenv [PR95418]
    
    Windows ABI (MinGW) is different than Linux ABI when bitfileds are involved.
    The following patch adds __attribute__ ((gcc_struct)) to struct fenv in order
    to match the layout of x87 state image in memory.
    
    2020-06-01  Uroš Bizjak  <ubizjak@gmail.com>
    
    libatomic/ChangeLog:
            * config/x86/fenv.c (struct fenv): Add __attribute__ ((gcc_struct)).
    
    libgcc/ChangeLog:
            * config/i386/sfp-exceptions.c (struct fenv):
            Add __attribute__ ((gcc_struct)).
    
    libgfortran/ChangeLog:
            PR libfortran/95418
            * config/fpu-387.h (struct fenv): Add __attribute__ ((gcc_struct)).

Diff:
---
 libatomic/config/x86/fenv.c         | 2 +-
 libgcc/config/i386/sfp-exceptions.c | 2 +-
 libgfortran/config/fpu-387.h        | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/libatomic/config/x86/fenv.c b/libatomic/config/x86/fenv.c
index 88622c613f3..138a67ff217 100644
--- a/libatomic/config/x86/fenv.c
+++ b/libatomic/config/x86/fenv.c
@@ -45,7 +45,7 @@ struct fenv
   unsigned int __data_offset;
   unsigned short int __data_selector;
   unsigned short int __unused5;
-};
+} __attribute__ ((gcc_struct));
 
 #ifdef __SSE_MATH__
 # define __math_force_eval_div(x, y) \
diff --git a/libgcc/config/i386/sfp-exceptions.c b/libgcc/config/i386/sfp-exceptions.c
index 72cb0f4d3bb..3aed0af7c46 100644
--- a/libgcc/config/i386/sfp-exceptions.c
+++ b/libgcc/config/i386/sfp-exceptions.c
@@ -39,7 +39,7 @@ struct fenv
   unsigned int __data_offset;
   unsigned short int __data_selector;
   unsigned short int __unused5;
-};
+} __attribute__ ((gcc_struct));
 
 #ifdef __SSE_MATH__
 # define __math_force_eval_div(x, y) \
diff --git a/libgfortran/config/fpu-387.h b/libgfortran/config/fpu-387.h
index 8b5e758c2ca..7ff5acdc933 100644
--- a/libgfortran/config/fpu-387.h
+++ b/libgfortran/config/fpu-387.h
@@ -85,7 +85,7 @@ struct fenv
   unsigned short int __data_selector;
   unsigned short int __unused5;
   unsigned int __mxcsr;
-};
+} __attribute__ ((gcc_struct));
 
 /* Check we can actually store the FPU state in the allocated size.  */
 _Static_assert (sizeof(struct fenv) <= (size_t) GFC_FPE_STATE_BUFFER_SIZE,