Silence more zealous GCC warning. (#8241)

backends/imgui_impl_opengl3.cpp

@@ -137,6 +137,7 @@
 #pragma GCC diagnostic ignored "-Wpragmas"                  // warning: unknown option after '#pragma GCC diagnostic' kind
 #pragma GCC diagnostic ignored "-Wunknown-warning-option"   // warning: unknown warning group 'xxx'
 #pragma GCC diagnostic ignored "-Wcast-function-type"       // warning: cast between incompatible function types (for loader)
+#pragma GCC diagnostic ignored "-Wstrict-overflow"          // warning: assuming signed overflow does not occur when simplifying division / ..when changing X +- C1 cmp C2 to X cmp C2 -+ C1
 #endif
 
 // GL includes

imgui_demo.cpp

@@ -153,6 +153,7 @@ Index of this file:
 #pragma GCC diagnostic ignored "-Wdouble-promotion"                 // warning: implicit conversion from 'float' to 'double' when passing argument to function
 #pragma GCC diagnostic ignored "-Wconversion"                       // warning: conversion to 'xxxx' from 'xxxx' may alter its value
 #pragma GCC diagnostic ignored "-Wmisleading-indentation"           // [__GNUC__ >= 6] warning: this 'if' clause does not guard this statement      // GCC 6.0+ only. See #883 on GitHub.
+#pragma GCC diagnostic ignored "-Wstrict-overflow"                  // warning: assuming signed overflow does not occur when simplifying division / ..when changing X +- C1 cmp C2 to X cmp C2 -+ C1
 #pragma GCC diagnostic ignored "-Wcast-qual"                        // warning: cast from type 'const xxxx *' to type 'xxxx *' casts away qualifiers
 #endif
 

imgui_draw.cpp

@@ -75,6 +75,7 @@ Index of this file:
 #pragma GCC diagnostic ignored "-Wdouble-promotion"                 // warning: implicit conversion from 'float' to 'double' when passing argument to function
 #pragma GCC diagnostic ignored "-Wconversion"                       // warning: conversion to 'xxxx' from 'xxxx' may alter its value
 #pragma GCC diagnostic ignored "-Wstack-protector"                  // warning: stack protector not protecting local variables: variable length buffer
+#pragma GCC diagnostic ignored "-Wstrict-overflow"                  // warning: assuming signed overflow does not occur when simplifying division / ..when changing X +- C1 cmp C2 to X cmp C2 -+ C1
 #pragma GCC diagnostic ignored "-Wclass-memaccess"                  // [__GNUC__ >= 8] warning: 'memset/memcpy' clearing/writing an object of type 'xxxx' with no trivial copy-assignment; use assignment or value-initialization instead
 #pragma GCC diagnostic ignored "-Wcast-qual"                        // warning: cast from type 'const xxxx *' to type 'xxxx *' casts away qualifiers
 #endif

imgui_tables.cpp

@@ -234,9 +234,10 @@ Index of this file:
 #pragma GCC diagnostic ignored "-Wpragmas"                          // warning: unknown option after '#pragma GCC diagnostic' kind
 #pragma GCC diagnostic ignored "-Wfloat-equal"                      // warning: comparing floating-point with '==' or '!=' is unsafe
 #pragma GCC diagnostic ignored "-Wformat-nonliteral"                // warning: format not a string literal, format string not checked
-#pragma GCC diagnostic ignored "-Wclass-memaccess"                  // [__GNUC__ >= 8] warning: 'memset/memcpy' clearing/writing an object of type 'xxxx' with no trivial copy-assignment; use assignment or value-initialization instead
 #pragma GCC diagnostic ignored "-Wdouble-promotion"                 // warning: implicit conversion from 'float' to 'double' when passing argument to function
 #pragma GCC diagnostic ignored "-Wformat"                           // warning: format '%p' expects argument of type 'int'/'void*', but argument X has type 'unsigned int'/'ImGuiWindow*'
+#pragma GCC diagnostic ignored "-Wstrict-overflow"
+#pragma GCC diagnostic ignored "-Wclass-memaccess"                  // [__GNUC__ >= 8] warning: 'memset/memcpy' clearing/writing an object of type 'xxxx' with no trivial copy-assignment; use assignment or value-initialization instead
 #endif
 
 //-----------------------------------------------------------------------------

imgui_widgets.cpp

@@ -85,9 +85,10 @@ Index of this file:
 #pragma GCC diagnostic ignored "-Wfloat-equal"                      // warning: comparing floating-point with '==' or '!=' is unsafe
 #pragma GCC diagnostic ignored "-Wformat"                           // warning: format '%p' expects argument of type 'int'/'void*', but argument X has type 'unsigned int'/'ImGuiWindow*'
 #pragma GCC diagnostic ignored "-Wformat-nonliteral"                // warning: format not a string literal, format string not checked
-#pragma GCC diagnostic ignored "-Wclass-memaccess"                  // [__GNUC__ >= 8] warning: 'memset/memcpy' clearing/writing an object of type 'xxxx' with no trivial copy-assignment; use assignment or value-initialization instead
 #pragma GCC diagnostic ignored "-Wdeprecated-enum-enum-conversion"  // warning: bitwise operation between different enumeration types ('XXXFlags_' and 'XXXFlagsPrivate_') is deprecated
 #pragma GCC diagnostic ignored "-Wdouble-promotion"                 // warning: implicit conversion from 'float' to 'double' when passing argument to function
+#pragma GCC diagnostic ignored "-Wstrict-overflow"                  // warning: assuming signed overflow does not occur when simplifying division / ..when changing X +- C1 cmp C2 to X cmp C2 -+ C1
+#pragma GCC diagnostic ignored "-Wclass-memaccess"                  // [__GNUC__ >= 8] warning: 'memset/memcpy' clearing/writing an object of type 'xxxx' with no trivial copy-assignment; use assignment or value-initialization instead
 #pragma GCC diagnostic ignored "-Wcast-qual"                        // warning: cast from type 'const xxxx *' to type 'xxxx *' casts away qualifiers
 #endif