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From 9bf3b68e118a749ab87f52649fd56aca059470e8 Mon Sep 17 00:00:00 2001
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From: Mark Eggleston <markeggleston@codethink.com>
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Date: Tue, 16 Apr 2019 09:09:12 +0100
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Subject: [PATCH 16/16] Suppress warning with -Wno-overwrite-recursive
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The message "Warning: Flag '-fno-automatic' overwrites '-frecursive'" is
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output by default when -fno-automatic and -frecursive are used together.
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It warns that recursion may be broken, however if all the relavent variables
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in the recursive procedure have automatic attributes the warning is
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unnecessary so -Wno-overwrite-recursive can be used to suppress it. This
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will allow compilation when warnings are regarded as errors.
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Suppress warning with -Wno-overwrite-recursive
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---
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gcc/fortran/lang.opt | 4 ++++
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gcc/fortran/options.c | 2 +-
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2 files changed, 5 insertions(+), 1 deletion(-)
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diff --git a/gcc/fortran/lang.opt b/gcc/fortran/lang.opt
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index dca3fd27aa3..e5074f614e3 100644
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--- a/gcc/fortran/lang.opt
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+++ b/gcc/fortran/lang.opt
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@@ -293,6 +293,10 @@ Wopenmp-simd
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Fortran
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; Documented in C
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+Woverwrite-recursive
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+Fortran Warning Var(warn_overwrite_recursive) Init(1)
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+Warn that -fno-automatic may break recursion.
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+
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Wpedantic
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Fortran
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; Documented in common.opt
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diff --git a/gcc/fortran/options.c b/gcc/fortran/options.c
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index f417f48f6a7..6cbc64bf1ae 100644
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--- a/gcc/fortran/options.c
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+++ b/gcc/fortran/options.c
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@@ -418,7 +418,7 @@ gfc_post_options (const char **pfilename)
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&& flag_max_stack_var_size != 0)
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gfc_warning_now (0, "Flag %<-fno-automatic%> overwrites %<-fmax-stack-var-size=%d%>",
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flag_max_stack_var_size);
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- else if (!flag_automatic && flag_recursive)
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+ else if (!flag_automatic && flag_recursive && warn_overwrite_recursive)
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gfc_warning_now (0, "Flag %<-fno-automatic%> overwrites %<-frecursive%>");
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else if (!flag_automatic && flag_openmp)
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gfc_warning_now (0, "Flag %<-fno-automatic%> overwrites %<-frecursive%> implied by "
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--
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2.11.0
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