[PATCH v2 04/16] gdb/testsuite: move getting_compiler_info to front of gdb_compile

[Nils-Christian Kempke <nils-christian.kempke@intel.com>]

The procedure gdb_compile queries its options via

   [lsearch -exact $options getting_compiler_info]

to check whether or not it was called in with the option
getting_compiler_info.  If it was called with this option it would
preprocess some test input to try and figure out the actual compiler
version of the compiler used.  While doing this we cannot again try to
figure out the current compiler version via the 'getting_compiler_info'
option as this would cause infinite recursion.  As some parts of the
procedure do recursively test for the compiler version to e.g. set
certain flags, at several places gdb_compile there are checks for the
getting_compiler_info option needed.

In the procedure, there was already a variable 'getting_compiler_info'
which was set to the result of the 'lsearch' query and used instead of
again and again looking for getting_compiler_info in the procedure
options.  But, this variable was actually set too late within the code.
This lead to a mixture of querying 'getting_compiler_info' or
doing an lserach on the options passed to the procedure.

I found this inconsistent and instead moved the variable
getting_compiler_info to the front of the procedure.  It is set to true
or false depending on whether or not the argument is found in the
procedure's options (just as before) and queried instead of doing an
lsearch on the procedure options in the rest of the procedure.
---
 gdb/testsuite/lib/gdb.exp | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index 6fbf74442c..381367ee6c 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -4412,6 +4412,13 @@ proc gdb_compile {source dest type options} {
 
     set outdir [file dirname $dest]
 
+    # If this is set, calling test_compiler_info will cause recursion.
+    if { [lsearch -exact $options getting_compiler_info] == -1 } {
+	set getting_compiler_info false
+    } else {
+	set getting_compiler_info true
+    }
+
     # Add platform-specific options if a shared library was specified using
     # "shlib=librarypath" in OPTIONS.
     set new_options {}
@@ -4428,7 +4435,7 @@ proc gdb_compile {source dest type options} {
     # default, unless you pass -Wno-unknown-warning-option as well.
     # We do that here, so that individual testcases don't have to
     # worry about it.
-    if {[lsearch -exact $options getting_compiler_info] == -1
+    if {!$getting_compiler_info
 	&& [lsearch -exact $options rust] == -1
 	&& [lsearch -exact $options ada] == -1
 	&& [lsearch -exact $options f90] == -1
@@ -4439,7 +4446,7 @@ proc gdb_compile {source dest type options} {
 
     # Treating .c input files as C++ is deprecated in Clang, so
     # explicitly force C++ language.
-    if { [lsearch -exact $options getting_compiler_info] == -1
+    if { !$getting_compiler_info
 	 && [lsearch -exact $options c++] != -1
 	 && [string match *.c $source] != 0 } {
 
@@ -4460,7 +4467,7 @@ proc gdb_compile {source dest type options} {
     # Place (and look for) Fortran `.mod` files in the output
     # directory for this specific test.  For Intel compilers the -J
     # option is not supported so instead use the -module flag.
-    if { [lsearch -exact $options f90] != -1 } {
+    if { !$getting_compiler_info && [lsearch -exact $options f90] != -1 } {
 	# Fortran compile.
 	set mod_path [standard_output_file ""]
 	if [test_compiler_info "gcc-*"] {
@@ -4473,7 +4480,6 @@ proc gdb_compile {source dest type options} {
 
     set shlib_found 0
     set shlib_load 0
-    set getting_compiler_info 0
     foreach opt $options {
         if {[regexp {^shlib=(.*)} $opt dummy_var shlib_name]
 	    && $type == "executable"} {
@@ -4505,8 +4511,9 @@ proc gdb_compile {source dest type options} {
 	} elseif { $opt == "shlib_load" && $type == "executable" } {
 	    set shlib_load 1
 	} elseif { $opt == "getting_compiler_info" } {
-	    # If this is set, calling test_compiler_info will cause recursion.
-	    set getting_compiler_info 1
+	    # Ignore this setting here as it has been handled earlier in this
+	    # procedure.  Do not append it to new_options as this will cause
+	    # recursion.
         } elseif {[regexp "^text_segment=(.*)" $opt dummy_var addr]} {
             if { [linker_supports_Ttext_segment_flag] } {
                 # For GNU ld.
@@ -4529,7 +4536,7 @@ proc gdb_compile {source dest type options} {
     # DWARF line numbering.
     # See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88432
     # This option defaults to on for Debian/Ubuntu.
-    if { $getting_compiler_info == 0
+    if { !$getting_compiler_info
 	 && [test_compiler_info {gcc-*-*}]
 	 && !([test_compiler_info {gcc-[0-3]-*}]
 	      || [test_compiler_info {gcc-4-0-*}])
-- 
2.25.1

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